Natural Herbal Remedies

Putting it all together Pathophysiology of Parkinsons disease

voiceover so we know that parkinson's disease causes problems with movements right and what we see in people with parkinson's disease is a reduction, a loss, a slowing down of movements.And this happens largely because of a loss of dopamine neurons in the brain.But, you might be wondering, what is so special about these dopamine neurons how do they actually cause these problems with movements what's going on here and that's actually a really great question.So let's have a look at how that all happens.So let's start off by jumping over here.

To the substantia nigra.And you might remember this, that the substania nigra is the main area in the brain where we see this big loss of dopamine neurons, right so we have these dopamine neurons here, in the substantia nigra, so they head over, they project to the striatum.So let's draw some of these, so here's some dopamine neurons here in the substantia nigra.And they go over here to the striatum.So they send their axions over here, and they go and they talk to neurons in the striatum.

And we actually have a name for this little bundle of dopamine neurons, this little highway that goes from the substantia nigra to the striatum.And we call it the nigrostriatal pathway.Nigro, because they head from the substantia nigra, and striatal, because they head over to the striatum.So, during parkinson's disease, these neurons, they start to die off, right we start to lose some of these neurons.And actually, this is really interesting.So as these neurons are starting to die, as we're starting to lose the neurons in parkinson's disease, what we also see,.

At the same time, is this formation of these little clumps of proteins in a lot of these neurons.And these are called lewy bodies.And these lewy bodies start to form, and we're not gonna go into the kind of, the pathological diagnosis of parkinson's disease at this point, but in what we call a post mortem exam, so after the person has died and we're looking at their brain, these lewy bodies are actually the main thing that we see in the brains of people with parkinson's disease.And the really interesting part, is the we actually.

Don't know at this point what role lewy bodies play in the disease.We don't know if they're, maybe involved in the loss of these dopamine neurons, or maybe if they're actually like a protective mechanism, to kind of, try to prevent more loss of dopamine neurons, or maybe something that we haven't even thought about yet.We just, we don't know at this point.And so that's kind of a interesting bit of research that's currently going on.So anyway, so back to our nigrostriatal pathway here.So more and more of these dopamine neurons die.

We lose more of them, and when we've lost about about 80 of them, so quite a bit right 80, that's when we start to see bradykinesia, and rigidity, and some problems with movements.The things that are actually the physical signs of parkinson's disease.So in order to figure out how this loss of dopamine neurons actually leads to the movement problems that we see, we have to kind of think back to the direct and the indirect pathways that the basal ganglia in our brains use to control our movements.

So i like to think of the thalamus as a dog, a dog on a leash.And it needs to be on a leash because we don't want it getting all excited.Because when the thalamus gets all excited, it causes our motor cortex to get too excited.And this causes our muscles to move too much, too much movement.Because remember, our motor cortex is what talks to our muscles to get them to move.So we keep our thalamus on a tight leash, right so this is what we do.

And we do this so it can't overexcite the motor cortex.And the basal ganglia, their job is to adjust the length of our leash.And this adjusts how active the thalamus can be.And they do this by talking to each other in the direct and the indirect pathways.So the aim of the direct pathway is to loosen our leash on the thalamus.To let our thalamus be a bit more active and chat with our motor cortex more, so that we can move around a bit more.So let's say maybe you're crossing the street,.

And the light is about to change.And, you know you're a good person, you don't wanna hold up traffic.So you need to go from walking to running, in order to make sure that you get to the other side in time, right so here is when your direct pathway would kind of kick in.So your substantia nigra would send off these dopamine signals to make the thalamus more active.And this would make you move a bit more, allow you to go from walking to running to get across the street.

But when we lose these dopamine neurons in the substantia nigra, the substantia nigra can't send much dopamine to the striatum.So this means that it can't amplify the direct pathway.It can't excite our muscles even more.So we can't get that extra muscle movement to get our friend here across the street faster.And on the flip side, remember that the aim of the indirect pathway, is to tighten that leash on our thalamus.And that's to reduce muscle movements.So maybe you made it to the other side,.

And now you wanna go from running to walking.So you wanna slow down the muscle activity in your legs, right so that you can slow down your steps and start to walk.So in this pathway, the substantia nigra uses its dopamine to kind of, finetune this, and make sure that we don't turn our muscle activity down too much, so that you're, you know, you wanna walk at a good pace.You don't wanna walk too slow.So the substantia nigra helps get you at that perfect pace.And it does this by loosening our leash on the thalamus.

And it causes more movement.When we lose these dopamine neurons in parkinson's disease, the substantia nigra, it can't send as much dopamine to the striatum to loosen the leash on the thalamus, right so our leash, it gets too tight, and our muscle movements are turned down too much.So, overall, with a loss of dopamine neurons in the nigrostriatal pathway, the substantia nigra, it just can't initiate more movement in the direct pathway.And it can't prevent an excessive reduction in movement in the indirect pathway, and that's why this loss.

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